不同模数下碱矿渣混凝土断裂冻融损伤分析  

Freeze-thaw fracture damage of alkali activated slag concrete under different modulus

作　　者：皇民 赵玉如 蔺世豪 王浩南 HUANG Min;ZHAO Yuru;LIN Shihao;WANG Haonan(School of Civil Engineering,Henan Institute of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南工程学院土木工程学院,河南郑州451191

出　　处：《混凝土》2021年第6期84-87,92,共5页Concrete

基　　金：国家自然基金项目(50878187);河南省科技攻关计划(212102310290);河南省教育厅自然科学研究重点项目(12A560004);郑州市科技发展计划项目(20130816);河南工程学院博士基金项目(D2012008)。

摘　　要：为获得碱矿渣混凝土的断裂冻融损伤规律,分别配制4种不同碱激发剂模数的碱矿渣混凝土进行冻融循环试验,再用三点弯曲法对试件进行加载.试验结果表明:激发剂模数对碱矿渣混凝土的断裂性能具有重要的影响,模数为1.6时,混凝土的断裂能和断裂韧度最高;冻融循环后的碱矿渣混凝土断裂能和断裂韧度均有明显下降,冻融循环次数越大,其下降幅度越大;不同模数下的碱矿渣混凝土的断裂冻融损伤均小于普通硅酸盐系的混凝土断裂冻融损伤;不同模数下的碱矿渣混凝土断裂冻融损伤与冻融循环次数可以用指数函数y=e-Ax来拟合;不同模数下的碱矿渣混凝土断裂冻融损伤由小到大的顺序分别为:模数1.6<模数2.0<模数1.2<模数0.8。In order to obtain the freeze-thaw fracture damage rule of alkali activated slag concrete,four kinds of alkali slag concrete with different modulus of alkali activator were prepared for freeze-thaw cycle test,and then three-point bending method was used to load the specimens.The test results show that the modulus of activator has an important influence on the fracture performance of alkali slag concrete.When the modulus is 1.6,the fracture energy and fracture toughness of concrete are the highest.The fracture energy and fracture toughness of alkali slag concrete after freeze-thaw cycle are obviously decreased,the greater the number of freeze-thaw cycles is,the greater the decrease range is.The freeze-thawing fracture damage of alkali slag concrete under different modulus is smaller than that of ordinary silicate concrete.The freeze-thaw fracture damage of alkali slag concrete under different modulus and the freeze-thaw cycles can be fitted by exponential function y=e-Ax;the order of freeze-thawing fracture damage of alkali slag concrete under different modulus from small to large is modulus 1.6<modulus 2.0<modulus 1.2<modulus 0.8.

关 键 词：模数 碱矿渣混凝土 断裂能 断裂韧度 冻融损伤 

分 类 号：TU528.041[建筑科学—建筑技术科学]